Set minimum amout to the CONTRIBUTE input field

We have bought both the whishlist and the crowdfunding plugins, and are trying to set up a dev site.
During testing, we have found a issue: we have been unable to add a minimum CONTRIBUTE amount value. We have found the way to add a minimum when enabling the “name your price” option, but the same minimum amount doesn’t apply to the CONTRIBUTE button: so the imput field CONTRIBUTE has no minimum fee, and the buyer can set an arbitrary amount with no lover limits!!!
Can you please tell me where to add a minimum amount to the CONTRIBUTE input field?? Or fix that issue if it can’t be done with actual plugin configuration??
Waiting for your kindly reply very asap.
Regards